Computer Mainboard ATXPWROK Control Circuit

Published:2011/7/19 7:52:00 Author:Sue | Keyword: Computer Mainboard, Control | From:SeekIC

When it is working, ATXPWROK is high level. Q45 is connected and Q44 is disconnected. +12V voltage will be put on Q43 and Q24's pin 2 through resistors, that is binary channels MOS tube's N channel's control pin is high level and the channel is connected. At that time, VCC voltage will output 5V USB voltage from pin7,pin8 through N-type MOS tube. At the same time, when ATXPWROK is high level, ATXPWROK # is low level, then ANT GATE U26 outputs low level. Q40 is disconnected and will output high level control signal to Q43 and 24's pin 4, that is binary channel MOS tube's P-type channel is disconnected. Then pin 5, pin 6 have no output current, that is 5VSB doesn't supply 5VUSB voltage.



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